All Fasturtle websites include SSL and are automatically HTTPS enabled by default! Simply point your custom domain's A-record (found at your domain provider) to the following IP address: 34.96.66.215 when you Publish your website.
Please note: When your website is served over HTTPS, any third-party widgets or custom code that are NOT served over HTTPS will cause a browser error and result in a broken webpage. You will need to contact the third-party directly to ask if they have an HTTPS-version of their code.
You can check to see if anything is causing an error prior to switching to HTTPS by simply reviewing your website in the Design panel of the Dashboard. If everything is working as expected in the Design panel, then you may enable HTTPS.